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/*
* Copyright (C) 2011 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/*
* Contains implementation of a class PreviewWindow that encapsulates
* functionality of a preview window set via set_preview_window camera HAL API.
*/
#define LOG_NDEBUG 0
#define LOG_TAG "EmulatedCamera_Preview"
#include <log/log.h>
#include <ui/GraphicBuffer.h>
#include "EmulatedCameraDevice.h"
#include "PreviewWindow.h"
namespace android {
PreviewWindow::PreviewWindow(GraphicBufferMapper* gbm)
: mPreviewWindow(NULL),
mGBM(gbm),
mPreviewFrameWidth(0),
mPreviewFrameHeight(0),
mPreviewEnabled(false)
{
}
PreviewWindow::~PreviewWindow()
{
}
/****************************************************************************
* Camera API
***************************************************************************/
status_t PreviewWindow::setPreviewWindow(struct preview_stream_ops* window,
int preview_fps)
{
ALOGV("%s: current: %p -> new: %p", __FUNCTION__, mPreviewWindow, window);
status_t res = NO_ERROR;
Mutex::Autolock locker(&mObjectLock);
/* Reset preview info. */
mPreviewFrameWidth = mPreviewFrameHeight = 0;
if (window != NULL) {
/* The CPU will write each frame to the preview window buffer.
* Note that we delay setting preview window buffer geometry until
* frames start to come in. */
res = window->set_usage(window, GRALLOC_USAGE_SW_WRITE_OFTEN);
if (res != NO_ERROR) {
window = NULL;
res = -res; // set_usage returns a negative errno.
ALOGE("%s: Error setting preview window usage %d -> %s",
__FUNCTION__, res, strerror(res));
}
}
mPreviewWindow = window;
return res;
}
status_t PreviewWindow::startPreview()
{
ALOGV("%s", __FUNCTION__);
Mutex::Autolock locker(&mObjectLock);
mPreviewEnabled = true;
return NO_ERROR;
}
void PreviewWindow::stopPreview()
{
ALOGV("%s", __FUNCTION__);
Mutex::Autolock locker(&mObjectLock);
mPreviewEnabled = false;
}
/****************************************************************************
* Public API
***************************************************************************/
void PreviewWindow::onNextFrameAvailable(nsecs_t timestamp,
EmulatedCameraDevice* camera_dev)
{
int res;
Mutex::Autolock locker(&mObjectLock);
if (!isPreviewEnabled() || mPreviewWindow == NULL) {
return;
}
/* Make sure that preview window dimensions are OK with the camera device */
if (adjustPreviewDimensions(camera_dev)) {
/* Need to set / adjust buffer geometry for the preview window.
* Note that in the emulator preview window uses only RGB for pixel
* formats. */
ALOGV("%s: Adjusting preview windows %p geometry to %dx%d",
__FUNCTION__, mPreviewWindow, mPreviewFrameWidth,
mPreviewFrameHeight);
res = mPreviewWindow->set_buffers_geometry(mPreviewWindow,
mPreviewFrameWidth,
mPreviewFrameHeight,
HAL_PIXEL_FORMAT_RGBA_8888);
if (res != NO_ERROR) {
ALOGE("%s: Error in set_buffers_geometry %d -> %s",
__FUNCTION__, -res, strerror(-res));
return;
}
}
/*
* Push new frame to the preview window.
*/
/* Dequeue preview window buffer for the frame. */
buffer_handle_t* buffer = NULL;
int stride = 0;
res = mPreviewWindow->dequeue_buffer(mPreviewWindow, &buffer, &stride);
if (res != NO_ERROR || buffer == NULL) {
ALOGE("%s: Unable to dequeue preview window buffer: %d -> %s",
__FUNCTION__, -res, strerror(-res));
return;
}
/* Let the preview window to lock the buffer. */
res = mPreviewWindow->lock_buffer(mPreviewWindow, buffer);
if (res != NO_ERROR) {
ALOGE("%s: Unable to lock preview window buffer: %d -> %s",
__FUNCTION__, -res, strerror(-res));
mPreviewWindow->cancel_buffer(mPreviewWindow, buffer);
return;
}
/* Now let the graphics framework to lock the buffer, and provide
* us with the framebuffer data address. */
void* img = NULL;
status_t status = mGBM->lock(*buffer,
GraphicBuffer::USAGE_SW_WRITE_OFTEN,
Rect(0, 0, mPreviewFrameWidth, mPreviewFrameHeight),
&img);
if (status != OK) {
ALOGE("%s: gralloc.lock failure: %d -> %s",
__FUNCTION__, res, strerror(res));
mPreviewWindow->cancel_buffer(mPreviewWindow, buffer);
return;
}
int64_t frame_timestamp = 0L;
/* Frames come in in YV12/NV12/NV21 format. Since preview window doesn't
* supports those formats, we need to obtain the frame in RGB565. */
res = camera_dev->getCurrentPreviewFrame(img, &frame_timestamp);
if (res == NO_ERROR) {
/* Show it. */
mPreviewWindow->set_timestamp(mPreviewWindow,
frame_timestamp != 0L ? frame_timestamp : timestamp);
mPreviewWindow->enqueue_buffer(mPreviewWindow, buffer);
} else {
ALOGE("%s: Unable to obtain preview frame: %d", __FUNCTION__, res);
mPreviewWindow->cancel_buffer(mPreviewWindow, buffer);
}
mGBM->unlock(*buffer);
}
/***************************************************************************
* Private API
**************************************************************************/
bool PreviewWindow::adjustPreviewDimensions(EmulatedCameraDevice* camera_dev)
{
/* Match the cached frame dimensions against the actual ones. */
if (mPreviewFrameWidth == camera_dev->getFrameWidth() &&
mPreviewFrameHeight == camera_dev->getFrameHeight()) {
/* They match. */
return false;
}
/* They don't match: adjust the cache. */
mPreviewFrameWidth = camera_dev->getFrameWidth();
mPreviewFrameHeight = camera_dev->getFrameHeight();
return true;
}
}; /* namespace android */
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